Test security is an important and rising concern among certifying agencies. Here are a few valuable resources
The Association of Test Publishers has a wiki that was developed to support their Security Initiative, which began in February 2006. You'll have to establish a wikispaces account to participate, but that's a quick and simple process. There are several good resources on the site, and since it's a wiki, you can request access to contribute to the site. Caveat: it doesn't say, but you may have to be an ATP member to contribute the the wiki. But, you don't have to be a member to view the valuable information there.
Also, Caveon is hosting two free webinars:
Wednesday, August 29, 12:00 EST Migrating your Paper-n-Pencil Test to the Computer with Security in Mind
Wednesday, Septembert 26, 12:00 EST - Do It Yourself Test Security
Source: Caveon's Cheating in the News Newsletter, 8-3-07